Piston-head



PATENT ()F ICE.

. UNITED 1 STATES Jenn waste, or FITVHIA'N, IILL'INOIS.

PIS QN-HTEAD-i SPECIFICATION fo'r'miiagof Letters Patent No. 224,258, dated February 3, 1880. I

.Application filed August 9, 1879.

nois, have invented a new and valuable Improvenientin Piston-Heads; and I do hereby declare that the following is a full, clear, and

exact description of the construction and operation of the same, reference being bad to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure 1 of the drawings isv a representation of a side elevation of myimproved piston-head. Fig. 2 is a central section thereof. Fig. 3 is a plan view of the same with one disk removed, and Figs. 4, 5, and 6 are details.

This invention has relation to improvements in pistons for steam and other engines.

The object of the invention is to prevent leaking from one side of the piston to the other, and thus to attain the full power of the steam or other force used, and to provide easy and economical means whereby ordinary wear and tear may be taken up and remedied as long as the frictional surfaces may last.

The nature of the. invention will be fully explained hereinafter, but consists. essentially, of two or more sets of expansible cleft rings arranged the one set within the other and between the two disks of the head,in combination with radial blocks carrying on their outeredges springs bearing against the inner set of rings, and a conical nut screwed upon the end of the piston-rod, whereby, as the .packing-rings, which break joints with each other, are worn away the wear may be taken up by screwing up the said nut, thus pressing the movable blocks outward and spreading the said rings againstthe walls of the cylinder, as will be hereinafter more fully set forth.

In the annexed drawings, the letter A designates the piston-rod, upon which is screwed one-of the disks B of .the head. The end of this rod projecting through this disk B is threaded. e i

0 indicates metallic. blocks formed or cast on the inner face of disk B at a suitable distance apart, and having between them the v blocks D, each of which is provided with a diameter as disk B.

the same.

corners of blocks 0 are rounded off, as seen in Fig. l, the curves being made with the center of the piston-rod as acenter, and being within and concentric to the perimeter of the disk. The blocks 0 are preferably cast with the said disk, and the blocks D form around the piston-rod an annular recess, 0, gradually narrowing as it approaches the said disk B.

E indicates a conical nut that is passedonto the screw-threaded part of the piston-rod with its small end foremost, and is provided on its larger end with a wrench-seat, d, projecting through a central aperture in the other end disk, B, of the head, by means ofwhich it is conveniently manipulated. Disk B is secured in place by strong screws extending through itinto the guide-blocks O, and is of the same these disks are arranged, in two layers, the packing-rings J J. The inner layer is composed of a single ring, J, having an oblique cleft, e, and the outer layer generally of two rings, J, whose combined widths are equal to the width of ring J, and tit snugly around The rings J are also cleft at e, and are so arranged relative to the inside ring, J, that the said clefts e are broken by the solid part of the inner ring and the cleft e of the inner ring by the splidagortion of the outer ones. Being gro und absolutely true and the joints of the rings being broken, leakage is not possible when the said rings are properly arranged.

The piston-head thus constructed operates in connection with a cylinder and its attachments, with the rings J bearing snugly against tight packing. As these rings wear away and In the interval between the interior walls of the cylinder, forming a the necessary tightness of the steam-joint is ure, designed to hold the outer rings in con- :00

tact with the cylinder snugly, but not with rings J J, arranged between the disks and sufficient force to bind and create undue pressbreakin g joints with each other, all constructed ure or friction. and arranged to operate substantial] y as shown I 5 What 1 claim as new, and desire to secure and described. 5 by Letters Patent, is- In testimony that I claim the above I have The comhinatiomin a piston having the hereunto subscribed myname in theprcsence spaced disks B B, the spaced fixed blocks 0 of two Witnesses.

between said disks, the piston-rod A having 7 thread a, of the expausible blocks D having JOHN vs 10 springs 11, and forming around the rod a con- Witnesses:

ical recess, 0, a conical expansion-nut, E, ap- NATHAN WELCH, plied upon the rod, and the expansible cleft- LINDSEY BOG-AN. 

